Add extern "C" to all the headers.

Change-Id: Idc249ff1b199b7c455f90092ff2c8a48b539faf4
diff --git a/minadbd/fuse_adb_provider.h b/minadbd/fuse_adb_provider.h
index 0eb1f79..23de44a 100644
--- a/minadbd/fuse_adb_provider.h
+++ b/minadbd/fuse_adb_provider.h
@@ -17,6 +17,14 @@
 #ifndef __FUSE_ADB_PROVIDER_H
 #define __FUSE_ADB_PROVIDER_H
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 int run_adb_fuse(int sfd, uint64_t file_size, uint32_t block_size);
 
+#ifdef __cplusplus
+}
+#endif
+
 #endif